Solar process heat plant at a brewery –

Experience and outlook

1Bastian Schmitt

1. Solar process heat

2. Pilot plant

3. Lessons learned

Kassel University - Institute of Thermal Engineering

Potential for solar process heat

Potential for solar process heat≈ 16 TWh/a (3,1 %) => approx. 40 Mio m² collector area

Numbers for GermanySource: The potential of solar heat for industrial processes in Germany (Uni Kassel 2012)

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Principles of system integration

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80..120 °C

120..250 °C

Up to 80 °C

Collectors for process heat applications

Flat plate collectors

Vacuum tube

Advanced flat plate collectors

CPC-, Fresnel-, parabolic through

collectors4

Outline

• Solar process heat

• Pilot plant at brewery

• Lessons learned

5

Hütt Brewery

Typical SME with 45 employees

Production in 2010:• 65,000 hl beer• 60 % bottled beer

Natural gas: 4.000 MWhElectricity: 1.000 MWh

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Pilot plant

Detailed case study

• Energy efficiency measures

• Optimization of heat recovery

• 155 m² flat plate collectors, 10 m³ solar buffer tank

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Pilot plant

• Pre heating of brewing water for hot water buffer

• Dependent on fill level

• Expected solar yield 480 kWh/m²a

• System costs 300 €/m² (incl. 50% subsidy)8

Outline

• Solar process heat

• Pilot plant at brewery

• Lessons learned

9

• No staff for energy management

• Poor knowledge regarding energy consumption

• Intense planning period of solar heating system

• Integration into hot water buffer relatively expensive

• Manual control of brewery staff

• Expected yield was not reached

• Share of production processes on overall consumption

• Relevance of utilities and space heating

Lessons learned

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Potential for energy efficiency

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Conclusion

• Large potential for solar heat

• Early market stage

• Large potential for energy efficiency

• Relevance of utilities, space heating, etc.

• Necessity of energy manager in SMEs

Thank you very much

bschmitt@uni-kassel.de

www.solar.uni-kassel.de12